Ignore logic Fixes

[RomneyDa]

Description

• Add checking defaults at every level
• New ignore function that works for a specific file, checking global/default ignores and then walking UP the tree to check .continueignore and .gitignore files.
• Uses this function for file change events
• Walkdir update: .continueignore overrides .gitignore in case of using !
• Speed improvements (although in some repos will be slower now that checking defaults at every level)

Fixes:

• Continue doesn't respect .gitignore #1196
• Recently Edited files cache doesn't check ignore patterns #2734
• .continueignore should override .gitignore #2739
• Indexing settings get ignored #4456

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